1900389156469 has 2 divisors, whose sum is σ = 1900389156470. Its totient is φ = 1900389156468.

The previous prime is 1900389156467. The next prime is 1900389156481. The reversal of 1900389156469 is 9646519830091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1808589246244 + 91799910225 = 1344838^2 + 302985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900389156469 - 2¹ = 1900389156467 is a prime.

It is a super-2 number, since 2×1900389156469² (a number of 25 digits) contains 22 as substring.

Together with 1900389156467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1900389156467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950194578234 + 950194578235.

It is an arithmetic number, because the mean of its divisors is an integer number (950194578235).

Almost surely, 2^{1900389156469} is an apocalyptic number.

It is an amenable number.

1900389156469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900389156469 is an equidigital number, since it uses as much as digits as its factorization.

1900389156469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12597120, while the sum is 61.

The spelling of 1900389156469 in words is "one trillion, nine hundred billion, three hundred eighty-nine million, one hundred fifty-six thousand, four hundred sixty-nine".